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1. |
For the signal – flow graph shown in the figure, which one of the following expression is equal to the transfer function \({\left. {\begin{array}{*{20}{c}} {Y\left( s \right)}\\ {\overline {{X_2}\left( s \right)} } \end{array}} \right|_{{X_1}\left( s \right) = 0}}?\) |
A. | \(\frac{{{G_1}}}{{1 + {G_2}\left( {1 + {G_1}} \right)}}\) |
B. | \(\frac{{{G_2}}}{{1 + {G_1}\left( {1 + {G_2}} \right)}}\) |
C. | \(\frac{{{G_1}}}{{1 + {G_1}{G_2}}}\) |
D. | \(\frac{{{G_2}}}{{1 + {G_1}{G_2}}}\) |
Answer» C. \(\frac{{{G_1}}}{{1 + {G_1}{G_2}}}\) | |